TW201814743A - Magnetic core strip and magnetic core - Google Patents

Abstract

An exemplary embodiment of the present invention provides a magnetic core and a magnetic core strip, the magnetic core comprising a plurality of magnetic core blocks that configure a closed magnetic circuit, wherein each magnetic core block is a layered body of a plurality of magnetic core strips, each magnetic core strip includes a layered structure, in which a plurality of amorphous ribbon strips are layered, and a magnetic steel plate disposed at at least one end face in a layering direction of the layered structure, and the layered structure and the magnetic steel plate are fixed at a layering face.

Description

Magnetic chip and core

The present invention relates to a magnetic chip and a magnetic core.

Silicon steel and soft ferrite are used as cores (cores) used in transformers, reactors, reactors, motors, noise countermeasure components, laser power supplies, pulsed magnetic components for accelerators, generators, etc. , High magnetic permeability alloy (permalloy), Fe-based amorphous alloy, Fe-based nanocrystalline alloy and other soft magnetic materials. Among them, a core manufactured by winding a soft magnetic material in a plate shape or a thin strip shape is known. Such a core is made by winding a long plate or a thin strip, so it is called a roll core or a roll core.

A wound magnetic core is generally manufactured by winding a thin ribbon into a desired inner diameter and outer diameter, and performing a heat treatment to remove the deformation introduced by the winding. However, the rolled state of the thin strip may not only limit the size of the wound magnetic core in manufacturing, but also cannot fully take advantage of the excellent characteristics of the amorphous thin strip, which has characteristics different from those of silicon steel. The reason is considered that the temperature of the heat treatment for maintaining the amorphous structure of the amorphous ribbon is lower than that of silicon steel, and the deformation introduced by winding cannot be sufficiently removed. That is, the shape of the wound core has a lack of freedom in design, and it is easy to damage the excellent characteristics of the amorphous ribbon.

As for the form of the magnetic core, a laminated magnetic core obtained by stacking thin strip segments is known in addition to a wound magnetic core. Regarding the technology of laminated magnetic cores, there have been disclosed iron cores obtained by alternately laminating grain-oriented electrical steel sheets and foils such as amorphous (for example, refer to Japanese Patent Application Laid-Open No. 5-275255). In addition, it has been disclosed that a method for manufacturing an iron core includes the following steps: laminating a plurality of strip-shaped amorphous magnetic materials, and impregnating or coating an adhesive on the laminated end of the amorphous magnetic material obtained by lamination. (For example, refer to Japanese Patent Application Laid-Open No. 62-108513). In addition, some have disclosed a method of stacking several amorphous alloy thin strips, producing a unit laminate having a thickness almost the same as that of a silicon steel plate, and stacking the laminates on each other to form a laminated body of a transformer core (for example, (See Japanese Patent Application Laid-Open No. 61-74314). In addition, it has been disclosed that a non-amorphous sheet having a wider width is arranged between non-amorphous sheets having a narrower width than a non-amorphous sheet, from the end of the amorphous sheet to the presence of non-amorphous A layered amorphous core obtained by disposing non-amorphous material in a region of the state plate and bolting the entire structure of the layered structure in this region (for example, refer to US Pat. No. 4,506,248).

[Problems to be Solved by the Invention] However, in Japanese Patent Application Laid-Open No. 5-275255, it is difficult to suppress energy loss because of the low volume fraction of amorphous materials because of the alternate arrangement of directional electromagnetic steel plates and foils such as amorphous materials. . In addition, Japanese Unexamined Patent Publication No. 62-108513 is a technology of laminating a plurality of strips (about 3 to 5 pieces) of a strip-shaped amorphous magnetic material and bonding the ends of the laminated body, and does not consider assembly afterwards Easy to assemble the core and coil when it reaches the transformer. Japanese Patent Application Laid-Open No. 61-74314 is a technology for manufacturing a laminated body by stacking a plurality of amorphous alloy thin strips, and the purpose is to maintain the same degree of workability as a silicon steel plate. Therefore, it is considered that the workability is closer to the workability when using a silicon steel plate than the case where the thin strip is directly handled, but in fact, when a very thin amorphous ribbon is stacked with thousands or more pieces of magnetic core, Simplifying the steps of the manufacturing process was not previously possible. Furthermore, the ease of assembling the magnetic core and the coil when the transformer is assembled later is not considered. In addition, US Pat. No. 4,506,248 discloses a structure obtained by laminating amorphous thin materials. However, because the amorphous thin material has a narrower width and a lower amorphous volume fraction than the non-amorphous plate, it is difficult to suppress energy loss. In addition, the entire structure of the structure after becoming a laminated structure is provided by bolts. It is mechanically fixed to form an integrated structure, and the amorphous thin material is processed in a cluster type. Therefore, the assembling operation of the magnetic core is complicated.

The present invention is based on the above situation. The problem to be solved by the present invention is to provide significantly improved operability of an amorphous ribbon sheet when manufacturing a laminated magnetic core using the amorphous ribbon sheet, and a stack using the amorphous ribbon sheet. Magnetic cores and cores for assembling layered cores. [Means for solving problems]

In order to significantly improve workability when stacking and assembling thin amorphous thin strips into a laminated magnetic core, the magnetic core is divided into several structural parts (block structure) and the divided blocks are used. It is meaningful to perform the steps of assembling the structure, and to prepare a thin strip unit of any shape and size that can be suitable for the divided block structure. Specific methods for solving the above problems include the following aspects.

The magnetic core system according to the first aspect of the present invention, <1> is provided with a plurality of magnetic core blocks forming a closed magnetic circuit, and the magnetic core block is a laminated body of a plurality of magnetic chips. The magnetic chip includes: The structure is obtained by laminating a plurality of amorphous thin strips; and the electromagnetic steel plate is arranged at least a part of each of the two end surfaces in the laminating direction of the laminated structure; and the laminated structure and the electromagnetic steel plate are fixed On the laminated surface.

In the first aspect of the magnetic core, the magnetic core block is configured using a plurality of magnetic chips. Therefore, not only does it become easy to handle extremely thin amorphous strips, but it also significantly improves the assembly workability of laminated cores of any shape and size. That is, in the first aspect, a plurality of amorphous thin strips are stacked, and an electromagnetic steel plate is disposed on at least a part of both end surfaces in the lamination direction of the laminated portion of the amorphous thin strips, and A magnetic chip obtained by fixing a laminated portion and an electromagnetic steel plate on a laminated surface is used as a unit of an amorphous thin strip. Thereby, it can be suitably used for any shape and size required for a magnetic core, and it is possible to securely secure the stacking accuracy at the time of manufacture and the strength necessary for an amorphous ribbon piece. Because it is not fixed on the surface where the lamination direction of the amorphous ribbon is regarded as a normal line, it is fixed on the lamination surface composed of the laminated amorphous ribbon and the electromagnetic steel plate, so it is caused by resin or adhesive. The deterioration of characteristics due to stress is small.

In addition, the "laminated layer" does not refer to a surface in which the lamination direction of the amorphous ribbon is taken as a normal line, but refers to a collection of side surfaces corresponding to the thicknesses of the laminated multiple amorphous ribbons and the electromagnetic steel plate. Formed faces.

The first aspect of the magnetic core described in the above <1> should preferably have the following aspect, <2> The closed magnetic circuit is formed by joining four magnetic core blocks into a square ring shape, and the two magnetic cores are adjacent to each other. Between the blocks, there are joints. The joints are inclined in a stepwise height difference between a plurality of stacked structures of the respective magnetic chips toward the long side direction of the magnetic core block, and are inclined with respect to the long side direction. The inclined surfaces with an angle θ inclined are joined to each other.

The first aspect of the magnetic core described in the above <2> is more suitable as the following aspect. <3> At the joint portion, the laminated structure is staggered to form a stepped gradient that is shifted along the longitudinal direction of the core block. The surface is formed by being inclined at an inclination angle of 30 ° to 60 ° with respect to the long side direction of the magnetic core block (that is, a deflection angle of -15 ° to + 15 ° with respect to 45 °).

For example, by joining four magnetic core blocks into a square ring shape, a magnetic core (core) having a square ring structure can be manufactured. At this time, if the easy-to-magnetize direction of each magnetic core block is the long side direction, the joint (connected portion) of the core blocks among the joints that are joined in a direction perpendicular to the easy-to-magnetize direction will be among them. In a magnetic core block, when the magnetic flux flows in a direction perpendicular to the long side direction (the direction that is easy to be magnetized), it is easy to increase iron loss and apparent power. In this regard, the respective magnetic chips of the two magnetic core blocks are joined to each other with inclined surfaces inclined at an inclination angle θ with respect to the long side direction of the magnetic core blocks, and the arrangement between the magnetic chips is stepped. The inclined surfaces are joined to each other, which can prevent the magnetic flux of one magnetic core block from intersecting with the magnetic flux of the other magnetic core block, and can suppress energy loss.

The first aspect of the magnetic core described in the above <1> should preferably have the following aspect. <4> Between the two core blocks adjacent to each other, the end faces of the respective magnetic chips in the stacking direction are mutually opposed. The jointed joint portion at which the electromagnetic steel plate of the magnetic chip in one magnetic core block and the electromagnetic steel plate of the magnetic chip in the other magnetic core block are arranged to face each other and come into contact.

At the joint portion, the two magnetic core blocks are overlapped with each other. Therefore, if the electromagnetic steel plate of one magnetic core block and the electromagnetic steel plate of the other magnetic core block face each other, it is easy to maintain the sliding property, and it becomes easy to extract the magnetic chip between the magnetic core blocks. This makes it possible to easily assemble or disassemble the magnetic core.

The first aspect of the magnetic core described in the above <1> should preferably have the following aspect: <5> The magnetic chip has two of the laminated structure; two first electromagnetic steel plates are arranged on the two laminated layers. Structures facing each other are opposite end faces; and a second electromagnetic steel plate is disposed between the two laminated structures; the two laminated structures are formed by one end in the longitudinal direction of one of the laminated structures and the other One end in the longitudinal direction of the laminated structure is staggered from a position overlapping each other in the longitudinal direction toward the longitudinal direction, and the two laminated structures are partially overlapped, and the laminated structure, the first electromagnetic The steel plate and the second electromagnetic steel plate are fixed to a plane including a laminated end face in a laminated portion of the two laminated structures.

In this aspect, there is a structure in which a specified number of amorphous thin strips are bundled and sandwiched between electromagnetic steel plates, and one end in the long side direction of one of the laminated structures and the long side of the other laminated structure One end of the direction is shifted from the position overlapping each other by a predetermined distance in the direction of the long side in the direction of the long side, and the two laminated structures are partially arranged. Therefore, it is easy to handle an extremely thin amorphous strip, and it is easy to bond the magnetic chips to each other. In addition, because the core block is manufactured using units that have been stacked in advance, it will be excellent in stacking accuracy and also in productivity. In addition, the second electromagnetic steel sheet disposed between the two laminated structures can be constituted by a single electromagnetic steel sheet that can be disposed on the entire surface of the laminated structure in a length corresponding to the entire length of the magnetic chip in the longitudinal direction. It can be configured by using two electromagnetic steel plates having a size that can be arranged on the entire surface of each end surface of the two laminated structures.

The magnetic core of the first aspect described in any one of the above <1> to <5> should preferably have the following aspect. <6> The laminated structure of the magnetic chip and the electromagnetic steel sheet are made of epoxy resin. Resin to fix.

It is difficult to maintain a predetermined shape of a plurality of amorphous thin strip pieces and electromagnetic steel sheets forming a laminated structure in a magnetic chip due to position deviation and the like. However, by fixing at least a part using an epoxy resin, a desired shape can be stably maintained for a long time.

The first aspect of the magnetic core described in any one of the above <1> to <6> should preferably have the following aspect. <7> The laminated structure is disposed on the entire surface of the electromagnetic steel sheet in the short-side direction.

The length of the laminated multiple amorphous strips is perpendicular to the length of the short side (width and length), because it is the length of the short side (width and length) perpendicular to the length of the electromagnetic steel sheet. Since the length is equal to or more than the same, the assemblability is improved. In addition, the volume fraction of the amorphous phase in the magnetic core becomes higher, which can suppress the energy loss more.

The magnetic chip system according to the second aspect of the present invention, <8> includes a laminated structure and is obtained by laminating a plurality of amorphous thin strips; and an electromagnetic steel plate arranged in a laminating direction of the laminated structure. At least a part of each of the two end surfaces; the laminated structure and the electromagnetic steel plate are fixed on the laminated surface.

In the magnetic chip of the second aspect, the plurality of amorphous thin strip pieces having a laminated structure and the electromagnetic steel plates arranged on both end faces in the laminated direction of the laminated structure are fixed. This makes it easy to handle extremely thin amorphous ribbons, and it is possible to manufacture magnetic cores of any shape and size with good efficiency (assembly work). [Effect of the invention]

According to the disclosure of the present invention, it is provided to significantly improve the operability of an amorphous ribbon sheet when manufacturing a laminated magnetic core using the amorphous ribbon sheet, and a laminate using the amorphous ribbon sheet. Magnetic cores and cores for assembly of magnetic cores.

An embodiment of the present invention will be described below. A magnetic core according to an embodiment of the present invention includes a plurality of magnetic core blocks constituting a closed magnetic circuit, and the magnetic core block is a laminated body of a plurality of magnetic chips. The magnetic chip includes: a laminated structure obtained by laminating a plurality of amorphous thin strips; and an electromagnetic steel plate arranged at least a part of each of the two end surfaces of the laminated structure in the laminating direction; the laminated structure The structure and the electromagnetic steel sheet are fixed to a laminated surface.

A magnetic core according to an embodiment of the present invention includes a magnetic chip for forming a plurality of magnetic core blocks constituting a closed magnetic circuit. Since the amorphous thin strip is used as the magnetic chip unit, it is easy to handle the extremely thin amorphous thin strip, and in addition, the workability for assembling a magnetic core of any shape and size is significantly improved.

In this specification, "amorphous ribbon" means the meaning of the strip-shaped alloy ribbon which has an amorphous phase. In addition, the "amorphous thin strip sheet" means a strip-shaped metal sheet (fragment) cut from a long amorphous alloy strip.

A magnetic core (hereinafter also referred to as a laminated core) refers to a laminated magnetic core obtained by stacking a plurality of amorphous thin strip pieces into, for example, a rectangular ring shape, and a thin amorphous thin core. There is a difference between the cores obtained by winding the tape. The magnetic core block refers to when a shape of the magnetic core is, for example, a quadrangle (square or rectangle, etc.), a plurality of magnetic chips (hereinafter also referred to as a lamination group) are used to form at least a part of the outer edge (such as The ends in the long-side direction of the chip are stacked so as to overlap each other, and the meaning of the structural part of the four sides of the quadrilateral includes those in a temporarily restrained state by a clamp or the like, and those in a state fixed by a resin or the like. The magnetic chip (laminated group) is a laminate obtained by laminating a plurality of amorphous thin strip pieces and a plurality of electromagnetic steel plates, and is a unit piece used in the manufacture of a magnetic core.

In addition, in this specification, the numerical range indicated using "~" means the range which uses the numerical value described before and after "~" as a lower limit and an upper limit.

Hereinafter, the first embodiment and the second embodiment, which are specific embodiments of the magnetic core of the present invention, will be described with reference to the drawings. Embodiments of the magnetic chip of the present invention will also be described in detail. However, the embodiments of the magnetic core and the magnetic chip of the present invention are not limited to the first embodiment and the second embodiment shown below.

(First Embodiment) A first embodiment of the magnetic core of the present invention will be described with reference to Figs. 1 to 13. In the first embodiment, a laminated core (magnetic core) of a square ring structure obtained by stacking a magnetic chip (hereinafter also referred to as a lamination group) as a unit sheet and using the lamination group as a unit is described in detail. It is explained that the magnetic chip has: two laminated structures, which are obtained by laminating a plurality of amorphous thin strips; and two first electromagnetic steel plates, which are arranged on the sides facing the two laminated structures. Are opposite end surfaces; and a second electromagnetic steel plate is disposed between the two laminated structures.

As shown in FIG. 1, the laminated core 100 of the first embodiment includes four magnetic core blocks 10A, 10B, 10C, and 10D. The four magnetic core blocks are arranged at a 90 ° angle to each other and are arranged in a square ring shape. The core pieces are joined at the end faces of the respective long sides. The four magnetic core blocks are joined between two mutually adjacent magnetic core blocks so that the lamination group of each magnetic core block becomes 90 ° with each other to form a square ring structure. A closed magnetic circuit is formed by joining four magnetic core blocks into a quadrangular ring shape. In addition, the four magnetic core blocks are stacked bodies each obtained by stacking a stack of magnetic chips on which amorphous thin strip sheets are stacked.

The lamination set of the first embodiment is formed by stacking the following elements: two laminated structures (symbol 23 in FIG. 3) obtained by laminating a plurality of amorphous thin strips; and two first electromagnetic steel plates (Symbol 25A in FIG. 3), which are arranged on the end faces opposite to each other with the two laminated structures facing each other; and a second electromagnetic steel plate (symbol 25B in FIG. 3), which are arranged on two laminates Between structures. In addition, FIG. 3 shows a laminated group (magnetic core) according to the first embodiment.

FIG. 1 is a perspective view conceptually showing a laminated core 100 according to the first embodiment. Figure 1 shows the arrangement of the four magnetic core blocks 10A, 10B, 10C, and 10D in a rectangular ring shape as the xy plane (including the x-axis and y-axis planes), and the normal direction of the xy plane as the z-axis direction.

In addition, the four magnetic core blocks 10A, 10B, 10C, and 10D have a length L-w1, a width w1, and a height T all having the same shape (cuboid) in appearance, and the laminated core 100 is a square with a length L. Square ring.

The laminated core 100 according to the first embodiment is configured by using a plurality of identical laminated groups, arranging a plurality of laminated groups in the shape of a square ring, and bonding both ends in the longitudinal direction of each laminated group to each other. To make. That is, the laminated core 100 is a square ring-shaped body obtained by joining four lamination groups, and one ring-shaped body is obtained by stacking one ring-shaped body in the z direction. Although the laminated core 100 according to the first embodiment is an example in which it is formed in a square shape, the present invention is not limited to a square shape, and may be formed into a rectangular shape such as a rectangle.

As in the first embodiment, it is not necessary to change the stacking method of the ring body on the odd-numbered layer (odd-numbered layer) and the even-numbered layer (even-numbered layer) when using the laminated core to make the laminated core. As shown in FIGS. 2A and 2B, the stacking method is changed for the odd-numbered layers (the first layer and the third layer) and the even-numbered layers (the second layer and the fourth layer). Specifically, the ring body to be the laminated core 100 may be formed by alternately overlapping the odd-numbered layers and the even-numbered layers as shown in FIG. 13.

The odd-numbered layer system is shown in FIG. 2A. One end of the lamination group 20D is overlapped on one end of the lamination group 20A, one end of the lamination group 20C is overlapped on the other end of the lamination group 20D, and the lamination group 20B is overlapped. A square ring structure obtained by overlapping one end on the other end of the lamination group 20C and overlapping the other end of the lamination group 20A on the other end of the lamination group 20B.

In addition, as shown in FIG. 2B, the even-numbered layers are overlapped in a direction opposite to the overlapping direction of the odd-numbered layers to form a square ring structure. Specifically, it has one end of the lamination group 30B superimposed on one end of the lamination group 30A, one end of the lamination group 30C superimposed on the other end of the lamination group 30B, and one end of the lamination group 30D on A square ring structure is obtained by overlapping the other end of the laminated group 30A on the other end of the laminated group 30C and the other end of the laminated group 30D.

As shown in FIG. 13, the laminated core 100 is such that the odd-numbered layers and the even-numbered layers are alternately stacked (for example, as shown in FIG. 13, the first layer (odd-numbered layer) C1, the second layer (even-numbered layer) C2, The third layer (odd-numbered layers) (C3 (orderly stacked) is made by the method of the desired number of layers (the number of stacks). The laminated core 100 in the first embodiment has a structure in which four sides of a quadrangular ring are each laminated into 11 laminated groups.

The magnetic core blocks 10A, 10B, 10C, and 10D forming the laminated core 100 according to the first embodiment are formed by laminating the lamination groups 20 each having the structure shown in FIG. 3. The lamination group is a lamination unit body obtained by laminating a plurality of amorphous thin strips which become four magnetic core blocks of a lamination core. In the first embodiment of the present invention, since a laminated unit body including a plurality of amorphous thin strip pieces is used, it becomes easy to handle the extremely thin amorphous thin strip pieces, and a magnetic core block having excellent stacking accuracy can be produced.

As shown in FIG. 3, the lamination group 20 includes: two thin belts 23 having a laminated structure obtained by laminating a plurality of amorphous thin strips 21; two electromagnetic steel plates (the first electromagnetic steel plate ) 25A, disposed on each end face of the two thin belts 23 facing opposite sides; electromagnetic steel plate (second electromagnetic steel plate) 25B, disposed between the two thin belts 23; resin layer 27, fixed Two thin belts 23 and electromagnetic steel plates 25A and 25B. In this state, the thin strips 23 obtained by laminating a plurality of amorphous thin strips, and the electromagnetic steel plates 25A and 25B stacked and arranged in the stacking direction of the thin strips 23 are formed by a resin formed on the laminated surface. Layer 27 to be fixed.

The thin strips 23 are obtained by laminating a plurality of amorphous thin strips, and the number of the amorphous thin strips in the two thin strips is the same. In the first embodiment, one thin belt is obtained by laminating 30 amorphous thin strips. Therefore, the number of laminations of the amorphous thin strips in the lamination stack 20 of the first embodiment is 60. In addition, the size of the amorphous thin strip is 426 mm in length × 142 mm in width.

The electromagnetic steel plate 25A has the same size in the width direction (short-side direction) as the thin belt 23 of the amorphous thin strip. That is, the thin strips 23 of the amorphous thin strip are arranged on the entire surface in the short-side direction of the electromagnetic steel sheet. The electromagnetic steel plate 25B is disposed between the two thin belts 23 and comes into contact with a part of the other surface in a state of being in contact with the entire surface of one of the two thin belts 23. Therefore, although the electromagnetic steel plate 25B is disposed between the two thin belts 23, the thin steel belts other than the two thin belts stacked on each other are exposed.

The surface roughness of the main plane of the electromagnetic steel sheet should be in the range of 0.10 μm to 0.20 μm, and more preferably in the range of 0.1 μm to 0.15 μm. If the surface roughness of the electromagnetic steel sheet is 0.20 μm or less, the sliding property is good when the electromagnetic steel sheets are in contact with each other, which is advantageous from the viewpoint of improving manufacturing efficiency.

Here, the laminated sheet group 20 will be further described with reference to FIG. 4. FIG. 4 (A) is a plan view when the laminated sheet group 20 shown in FIG. 3 is placed on a horizontal table and the electromagnetic steel plate 25A is viewed from above. 4 (B) is a side view of the laminated stack 20 shown in FIG. 3 as viewed from the side. The resin layer 27 in FIG. 3 is not shown in FIG. 4.

As shown in FIG. 4 (A), the lamination group 20 of the first embodiment is such that one of the lamination groups 20 is opposite to the other in the longitudinal direction end (the end in the direction of length y1 or y2 (L-w1)). In a manner that the end positions of) are not aligned, the two thin belts 23 arranged staggered become one side of a square ring of length L as shown in FIG. 1. As shown in FIG. 4 (B) when the laminated sheet group 20 is viewed from the side, the laminated sheet group 20 of the first embodiment has an electromagnetic steel plate 25A / thin belt 23 / electromagnetic steel plate 25B / thin belt 23 / electromagnetic steel plate. 25A laminated part. The laminated portion is fixed by the resin layer 27. In the first embodiment, as shown in FIG. 5, in the laminated portion of the electromagnetic steel plate 25A / thin belt 23 / electromagnetic steel plate 25B / thin belt 23 / electromagnetic steel plate 25A, the two thin belts 23 share the electromagnetic steel plate 25B. Part of it. As shown in FIG. 4 (B), one of the two thin belts 23 is opposite to the side where the electromagnetic steel plate 25A is arranged, and the electromagnetic steel plate 25B is arranged. The two thin belts 23 are arranged so as to be staggered from each other in the plane direction of the electromagnetic steel plate 25B. As a result, in one of the thin strips 23, a part of the surface of the electromagnetic steel plate 25B is exposed, and in the other thin strip 23, the surface on the side opposite to the electromagnetic steel plate 25A is exposed. In addition, when the lamination group 20 shown in FIG. 3 is used, as shown in FIG. 5, a plurality of lamination groups 20 can be combined to connect them without height difference.

As for the modified example of the lamination group, as shown in FIG. 6 to FIG. 8, a single strip longer than the thin belt 23 may be sandwiched between the two thin belts (laminated structure) 23. The electromagnetic steel plates 25C are laminated, and the single electromagnetic steel plate 25C is disposed on the entire surface of the two surfaces facing each other of the two sheet layers. Specifically, as shown in FIG. 6, the laminated sheet group 120 may include a laminated portion of the electromagnetic steel plate 25A / thin belt 23 / electromagnetic steel plate 25C / thin belt 23 / electromagnetic steel plate 25A. The laminated portion of the laminated sheet group 120 is fixed by the resin layer 27. At this time, as shown in FIG. 7, the electromagnetic steel plate 25C has a predetermined total length of two thin belts arranged one by one so as to be misaligned with respect to the position of the end face of the other side in the longitudinal direction. The distance L), that is, has the same length and width as the total length in the longitudinal direction of the laminated group 120. Electromagnetic steel plate 25C, the electromagnetic steel plate 25C is shared by the two thin belts 23 in the laminated portion of the electromagnetic steel plate 25A / thin belt 23 / electromagnetic steel plate 25C / thin belt 23 / electromagnetic steel plate 25A. The portion where the two thin belts 23 are not overlapped), the electromagnetic steel plate 25C is arranged to cover a part of the surface of one of the thin belts and the other thin belt, and the electromagnetic steel plate 25C is exposed. When the laminated sheet group 120 shown in FIG. 6 is used, as shown in FIG. 8, laminated sheet groups 121 having different laminated structures can be prepared to obtain a plurality of laminated sheet groups connected together.

In addition, as for other modified examples of the laminated group, as shown in FIG. 9 to FIG. 10, a structure in which two electromagnetic steel plates are arranged between two thin belts (laminated structure) 23 may be used. Specifically, as shown in FIG. 9, a lamination group 220 obtained by laminating the following components can be obtained: two thin belts (laminated structure) 23, which are obtained by laminating a plurality of amorphous thin strips; and The first electromagnetic steel plates 25A are disposed on one of the opposite sides of the facing side of the two thin strips; and the second electromagnetic steel plates 25B are disposed on the two thin strips of each thin strip facing each other. Side face. At this time, each of the thin strips 23 sandwiched by two electromagnetic steel plates is arranged so as to be staggered from each other in the plane direction of the electromagnetic steel plates 25B to become a part of the surface of the electromagnetic steel plates 25B where the thin strips of the laminated group are not overlapped. Exposed state.

The lamination group 220 is shown in FIG. 9, and the end surface position of one of the two thin strip pieces 23 held by the electromagnetic steel plate with respect to the other in the longitudinal direction end (the end in the direction of the length y1 or y2) It is made by staggering the way. As shown in FIG. 9 (B) when the lamination group is viewed from the side, the lamination group 220 has a laminated electromagnetic steel plate 25A / thin belt 23 / electromagnetic steel plate 25B / electromagnetic steel plate 25B / thin steel belt 23 / electromagnetic steel plate 25A structure. At this time, the two pieces of the electromagnetic steel plate 25B in the laminated structure are shared in a state where the two pieces are overlapped. When the laminated sheet group 220 shown in FIG. 9 is used, as shown in FIG. 10, a plurality of laminated sheet groups 220 can be combined to be connected together.

In addition, as for other modification examples of the lamination group, as shown in FIG. 11 to FIG. 12, an electromagnetic steel plate is not provided between the two thin belts 23 and the opposite side to the side facing each other. Each end surface has a structure in which an electromagnetic steel plate 25A is disposed. According to this modification, the step overlap shape described in the second embodiment described later is preferable from the viewpoint of suppressing iron loss. Specifically, as shown in FIG. 11, a lamination group 320 obtained by laminating the following elements is obtained: two thin ribbons (laminated structure) 23 are obtained by laminating a plurality of amorphous thin ribbons; and The two first electromagnetic steel plates 25A are arranged on one of the opposite sides of the two thin belts facing each other. At this time, two thin belts 23 obtained by arranging electromagnetic steel plates on one of the surfaces are used, and one of the thin belts has the long-side end (on the long side y1 or y2) for the other thin belt due to the surface direction. The end positions in the direction) are misaligned with each other so that the positions of the end faces are not aligned with each other, and a part of the surface of the thin belts in the non-overlapping portion of the thin belts of the laminated group is exposed. The laminated group 320 has a laminated structure of the electromagnetic steel plate 25A / thin belt 23 / thin belt 23 / electromagnetic steel plate 25A, as shown in FIG. 11 when the laminated group is viewed from the side. When the laminated sheet group 320 shown in FIG. 11 is used, a plurality of laminated sheet groups 320 may be combined and connected together as shown in FIG. 12.

Here, an amorphous alloy (composition) that forms an amorphous ribbon will be described. Regarding the amorphous alloy ribbon, the alloy composition described in International Publication No. 2013/137117, International Publication No. 2013/137118, International Publication No. 2016/084741, and the like can be appropriately referred to. Among the amorphous alloy ribbons, Fe-based amorphous alloys are preferred. Fe-based amorphous alloy refers to an amorphous alloy containing Fe as a main component. In addition, "main component" means the component with the highest content ratio. For Fe-based amorphous alloys, containing Fe, Si, and B, when the total content of Fe, Si, and B is 100 atomic%, the content of Fe is 50 atomic% or more (preferably 60 atomic% or more, more preferably Fe-based amorphous alloys (at least 70 atomic%) are particularly preferred.

The characteristics of the amorphous alloy forming the amorphous alloy ribbon, especially in order to obtain the characteristics required for a transformer, are effective for the amorphous ribbon system in which the longitudinal direction of the ribbon is easily magnetized by heat treatment. In order to obtain such an amorphous ribbon, when performing the heat treatment, it is suitable to use, for example, a method of performing heat treatment (stretch annealing) in a stretched state, or applying a magnetic field in the direction of the long side of the ribbon. A method of performing heat treatment in a state, a method of performing heat treatment in a state where a magnetic field is applied in a long direction of the thin strip while stretching. In addition, the heat treatment can temporarily fix a laminate obtained by laminating a plurality of amorphous thin strips between metal plates and place it in a furnace to perform a heat treatment while maintaining the state of the laminate.

The surface roughness of the surface of the amorphous strip is preferably in the range of 0.20 μm to 0.50 μm, and more preferably in the range of 0.20 μm to 0.40 μm, when the arithmetic average roughness measured according to JIS B0601-2001. When the surface roughness is 0.20 μm or more, it is advantageous from the viewpoint of ensuring interlayer insulation when an amorphous ribbon is laminated. When the surface roughness is 0.40 μm or less, it is advantageous from the viewpoint of increasing the occupation ratio of the laminated magnetic core.

Generally speaking, an electromagnetic steel sheet manufactured by cold rolling and subsequent formation of a surface film has a higher surface accuracy, that is, a smaller surface roughness, than an amorphous ribbon produced by a liquid quenching method. The absolute value of the difference between the surface roughness of the electromagnetic steel sheet and the surface roughness of the amorphous thin strip is preferably 0.4 μm or less, and more preferably 0.2 μm or less. If the absolute value of the difference between the surface roughness of the two is 0.2 μm or less, it is advantageous from the viewpoint of increasing the occupation ratio of the laminated core.

The resin layer 27 is, for example, a laminated surface (a side surface corresponding to each thickness of the thin strip and the electromagnetic steel plate) attached to the laminated portion of the electromagnetic steel plate 25A / thin belt / electromagnetic steel plate 25B / thin belt / electromagnetic steel plate 25A. The surface formed by the assembly), and the electromagnetic steel sheet and the sheet side in the laminated portion are fixed.

The resin layer 27 is formed using an epoxy resin. It is preferable to form a resin layer by laminating an amorphous thin strip sheet, and applying and curing a curable resin (for example, an epoxy resin) on at least a part of the laminated surface of the laminated structure of the amorphous thin strip. Since a plurality of amorphous thin strips and electromagnetic steel plates are fixed by curing the resin, the stacking accuracy of the amorphous thin strips is improved, and it is easy to maintain a good shape of the laminated group. In the laminated structure of an amorphous ribbon, a resin layer is formed by not applying a curable resin on the main surface with the laminating direction of the amorphous ribbon as a normal surface, and applying a curable resin on the laminated surface. In order to reduce and suppress the distortion easily caused by shrinkage accompanied by hardening, and to suppress the deterioration of characteristics caused by stress.

The laminated sheet group can be manufactured as follows, for example. After continuously applying heat to the elongated amorphous alloy thin strip, it is cut (cut, punched) to a desired size and laminated, and an epoxy system is given to the laminated surface of the obtained laminate. A resin layer is attached for fixing. Alternatively, as for other methods, an amorphous alloy ribbon having a desired composition may be first produced and cut to a desired size, and several cut pieces of the amorphous ribbon may be stacked to become a laminate. The state is sandwiched between metal plates and temporarily fixed. After that, it is placed in a furnace and subjected to heat treatment. After cooling, an epoxy resin or the like is applied to the laminated surface of the laminate to attach a resin layer to fix it.

The resin layer can be formed using a curable resin, and for example, an epoxy resin is suitably used. As an example of the epoxy-based resin, a two-liquid mixed type epoxy resin composition composed of a liquid A containing an epoxy resin and a liquid B containing a hardener can be used.

There is no particular limitation on the method for forming the resin layer, and a known coating method can be used. For example, it is suitable to use a brush or A method for applying a coating member such as a doctor blade.

The thickness of the resin layer 27 is not particularly limited, and it may be appropriately selected in consideration of the strength, long-term durability, and the like required for the fixed laminated portion.

In the above embodiment, as shown in FIG. 3 and FIG. 6, two thin ribbons formed by stacking a plurality of amorphous thin ribbons are arranged such that one end of one thin ribbon is from one end of the other thin ribbon. A magnetic chip (laminated group) in a form that is shifted by a predetermined distance toward the other end in the long-side direction of the thin belt is described as a center, but the present invention is not limited to such a form, and any laminated unit may be selected as a Unit (laminated unit body). As a specific example, as shown in FIG. 17, as a magnetic chip (stacked group 420) of the following form: a laminated structure 23 obtained by stacking a plurality of amorphous thin strip sheets 21, and The two electromagnetic steel plates 25A sandwiching the laminated structure 23 are fixed by a resin layer 27.

(Second Embodiment) A second embodiment of a magnetic core according to the present invention will be described with reference to Figs. 14 to 16. The second embodiment is a step of forming the joint portion of the laminated core group in the core block forming the laminated core (magnetic core) of the first embodiment described above, and the laminated groups are opposite to each other in the longitudinal direction. Step overlap structure obtained by laminating the inclined surfaces inclined at 45 ° to each other.

In addition, the same constituent elements as those in the first embodiment are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

As shown in FIG. 14, the lamination group (magnetic chip) 140 includes five thin belts 30 and a pair of electromagnetic steel plates 35 arranged to sandwich one of the five thin belts 30. In this state, the five thin belts 30 and the two electromagnetic steel plates 35 are fixed by a resin layer not shown in the figure. This resin layer is coated with an epoxy system on a laminated surface formed by overlapping the thin layer and the electromagnetic steel plate. The resin is formed by hardening. In addition, FIG. 14 (A) is a plan view when the lamination group is placed on a horizontal table, and the lamination group is viewed from above the lamination direction, and FIG. 14 (B) is a side view when the lamination group is viewed from the side. FIG. 14 does not show the amorphous alloy thin strips and the resin layers forming the thin strips of the laminated group.

As shown in FIG. 14, the lamination group 140 is formed by laminating the five thin belts 30 each by a predetermined distance t1 and laminating the thin belts 30 on both ends in the laminating direction of the thin belts. Each of the two electromagnetic steel plates 35 is a laminated structure obtained by staggering the distance t1 in the long-side direction in the same manner as the thin belts. Each of the laminated thin strips 30 is obtained by laminating a plurality of amorphous thin strips.

As shown in FIG. 14 (A), the thin belt 30 cuts both ends of a rectangle having a length L in the longitudinal direction to an inclination angle of 45 ° with respect to the longitudinal direction (θ1 = 45 °, θ2 ( = 180 ° -θ1) = 135 °) and are formed into trapezoidal shapes in which the lengths of the lower and upper soles are L1 and L2, respectively. Although not shown in the figure, the same treatment is performed on the electromagnetic steel sheet. The angle of the inclination angle θ1 may be selected from a range of acute angles exceeding 0 ° to 90 °, and the angle of the inclination angle θ2 may be selected from a range of obtuse angles exceeding 90 ° to 180 °, where the inclination angle θ1 is preferably 30 ° A range of acute angles of ~ 60 ° (relative to the deflection angles of -15 ° ~ + 15 ° of 45 °).

Next, the joints which form the stacks of square rings to be joined to each other will be described. The joining part of the second embodiment is a joining form using a stepped overlapping structure. As described above, the quadrangular ring of the magnetic core block is formed by joining two ends of each of the four lamination groups in the longitudinal direction with each other. Each lamination group is arranged by staggering the thin belts 30 in a trapezoidal shape at a distance t1, as shown in FIG. 14 (A), at both ends of the long-side direction, tilts are formed at inclination angles of θ1 and θ2. The step-like height difference caused by the formed thin belt.

To prepare four such lamination groups, for example, as shown in FIG. 15, firstly superimpose lamination on the visible surface of one of the two areas (w2 × w2 square area) of the lamination group 140A that become the joint. The sheet group 140B becomes the invisible surface (back surface) of the other of the two areas (w2 × w2 square area) of the joint portion. On the visible surface of one of the areas of the lamination group 140B, the invisible surface (back side) of the other area of the two areas (w2 × w2 square area) of the overlapping portion of the lamination group 140C. On the visible surface of one of the areas of the lamination group 140C, the invisible surface (back side) of the other area among the two areas (w2 × w2 square area) of the overlapped group 140D. Then, an invisible surface of the other region of the lamination group 140A is superimposed on one of the regions of the lamination group 140D. This can become a square ring structure.

The second embodiment has a square ring structure formed by stacking a plurality of four lamination groups A to D to form a magnetic core (laminated core) having a desired shape. In the second embodiment, the structural part that becomes the four sides of the laminated core produced by stacking the square ring structure is a magnetic core block. Specifically, although not shown in the figure, by stacking the square ring structure, for example, The laminated portion formed by stacking the laminated group 140A is a magnetic core block.

For example, on the visible surface of one of the two regions of the lamination group 140A, when the invisible surface (back surface) of the other of the two regions of the lamination group 140B is overlapped, it is formed on the visible surface. The stepped stepped portions and the stepped stepped portions formed on the invisible surface face each other to form a plurality of joint surfaces. That is, as shown in FIG. 16, for example, there is a structure (step overlap structure) where the junction R of the amorphous thin strip sheet is staggered and staggered between the laminated sheet group 140A and the laminated sheet group 140B.

Such a step-overlap structure exists because the steps are staggered in sequence, and it is not easy to generate a phenomenon that the magnetic flux is concentrated in the joint at the joint, which can reduce and suppress iron loss and apparent power.

The entire contents of Japanese Patent Application No. 2016-195059 filed on September 30, 2016 are incorporated herein by reference. In addition, all documents, patent applications, and technical specifications described in this specification are incorporated into this specification as a reference, and each document, patent application, and technical specification is incorporated as a reference, and each document and patent application is specifically and individually recorded. And technical specifications.

L, y1, y2, L1, L2‧‧‧ length

W, w1, w2‧‧‧Width

T‧‧‧ height

R‧‧‧ Junction

10A, 10B, 10C, 10D‧‧‧ magnetic core block

20, 20A, 20B, 20C, 20D, 30A, 30B, 30C, 30D, 120, 140, 140A, 140B, 140C, 140D, 210, 220, 320, 420‧‧‧ stacks (magnetic chips)

21‧‧‧Amorphous thin strip

23, 30‧‧‧thin belts

25A, 25B, 25C, 35‧‧‧ electromagnetic steel plate

27‧‧‧resin layer (epoxy layer)

100‧‧‧ laminated core (magnetic core)

[FIG. 1] FIG. 1 is a perspective view conceptually showing a laminated core according to an embodiment. [FIG. 2A] FIG. 2A is a plan view showing a square ring structure with odd layers forming a laminated core. [Fig. 2B] Fig. 2B is a top view showing a square ring structure with an even number of layers forming a laminated core. [FIG. 3] FIG. 3 is a perspective view showing an example of a laminated packet of a laminated unit of a plurality of amorphous thin strips. [FIG. 4] FIG. 4, (A) is a schematic plan view of FIG. 3, and (B) is a schematic side view of FIG. 3. [FIG. 5] FIG. 5 is a schematic side view showing a form in which a plurality of laminated sets of FIG. 3 are connected. [FIG. 6] FIG. 6 is a perspective view showing another example of a lamination group of a laminated unit body of a plurality of amorphous thin strips. [FIG. 7] FIG. 7, (A) is a schematic plan view of FIG. 6, and (B) is a schematic side view of FIG. 6. [FIG. 8] FIG. 8 is a schematic side view showing a form in which a plurality of laminated sets of FIG. 6 are connected. [FIG. 9] FIG. 9, (A) is a schematic top view of a laminated group, and (B) is a schematic side view of the laminated group. [Fig. 10] Fig. 10 is a schematic side view showing a state in which a plurality of laminated sets of Fig. 9 are connected. [FIG. 11] FIG. 11, (A) is a schematic plan view of a laminated group, and (B) is a schematic side view of the laminated group. [Fig. 12] Fig. 12 is a schematic side view showing a state in which a plurality of laminated sets of Fig. 11 are connected. [Fig. 13] Fig. 13 is a schematic explanatory diagram for explaining that two kinds of square rings obtained by joining four lamination groups are alternately overlapped as a magnetic core. [Fig. 14] A diagram showing an example of a suitable lamination set when the joint portion becomes a step-lap structure. (A) The lamination set is placed on a horizontal table top from above the lamination direction. (B) is a side view when (A) is viewed from the side. [Fig. 15] Fig. 15 is a plan view showing a laminated core obtained by joining the joints of the four laminated groups in a stepwise overlapping structure. [FIG. 16] FIG. 16 is a schematic cross-sectional view for explaining a step overlap structure of a joint portion. [FIG. 17] FIG. 17 is a perspective view showing another example of a laminated group of laminated unit cells of a plurality of amorphous thin strips.

Claims (8)

A magnetic core is provided with a plurality of magnetic core blocks forming a closed magnetic circuit. The magnetic core block is a stacked body of a plurality of magnetic chips. The magnetic chip includes: a laminated structure, which is a stack of a plurality of amorphous thin strips. And the electromagnetic steel plate is disposed at least at a part of each of the two end surfaces in the laminated direction of the laminated structure; and the laminated structure and the electromagnetic steel plate are fixed on the laminated surface. For example, the magnetic core of item 1 of the patent application scope, wherein the closed magnetic circuit is formed by connecting four magnetic core blocks into a square ring shape, and there are joints between two adjacent magnetic core blocks. The joint portion is formed by staggering a plurality of laminated structures of the respective magnetic chips along the longitudinal direction of the magnetic core block to form a stepped height difference, and the inclined surfaces are inclined at an inclination angle θ with respect to the longitudinal direction. For example, the magnetic core of the second patent application range, wherein the inclined surface in the joint portion is formed by inclining at an inclination angle of 30 ° to 60 ° with respect to the long side direction of the magnetic core block. For example, the magnetic core of the first scope of the patent application, wherein, between two magnetic core blocks adjacent to each other, there is a joint portion where the end faces of the respective magnetic chips in the stacking direction are joined to each other. The electromagnetic steel plate of the magnetic chip in one of the magnetic core blocks is in contact with the electromagnetic steel plate of the magnetic chip in the other magnetic core block. For example, the magnetic core of the first scope of the patent application, wherein the magnetic chip has two of the laminated structure; two first electromagnetic steel plates are arranged on the opposite sides of the side facing the two laminated structures. The end surface and the second electromagnetic steel plate are arranged between the two laminated structures; the two laminated structures have one end in the longitudinal direction of one of the laminated structures and one end in the longitudinal direction of the other laminated structure. It is staggered from a position overlapping each other in the longitudinal direction toward the longitudinal direction, and the two laminated structures are partially overlapped, and the laminated structure, the first electromagnetic steel sheet, and the second electromagnetic steel sheet are fixed. A plane including a lamination plane in a short side direction perpendicular to the long side direction of the laminated structure. For example, the magnetic core according to any one of claims 1 to 5, wherein the laminated structure and the electromagnetic steel plate in the magnetic chip are fixed using an epoxy resin. For example, the magnetic core according to any one of claims 1 to 5, wherein the laminated structure is disposed on the entire surface in the short-side direction of the electromagnetic steel plate. A magnetic chip comprising a laminated structure obtained by laminating a plurality of amorphous thin strips; and an electromagnetic steel plate arranged at least a part of each of both end faces in a laminated direction of the laminated structure, the laminated structure The structure and the electromagnetic steel sheet are fixed to a laminated surface.